rol.c File Reference

Implements the OP_ROTL opcode rotate-left (uint32). More...

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Functions
	free_value (vs)
	free_value (va)
	push_value (vm, make_int((int64_t)(uint64_t) r))

Variables
case	OP_ROTL
Value	va = pop_value(vm)
uint32_t	a = (va.type == VAL_INT) ? (uint32_t)va.i : 0u
uint32_t	s = (vs.type == VAL_INT) ? (uint32_t)vs.i : 0u
s &uint32_t	r = (s == 0u) ? a : ((a << s) | (a >> (32u - s)))
	break

Detailed Description

Implements the OP_ROTL opcode rotate-left (uint32).

Opcode snippet included by vm.c. Performs a 32-bit unsigned rotate-left of an integer operand by a masked rotation count.

Stack effects:

• pops: s, a
• pushes: (a << s) | (a >> (32 - s)), with s masked to 0..31

Notes:

• Both a (value) and s (count) are taken from VAL_INT; non-integers are 0.
• The rotation count is masked to 0..31. A zero rotation returns a unchanged.
• Result is pushed as VAL_INT with the 32-bit value preserved in the low bits.

Definition in file rol.c.

Function Documentation

free_value() [1/2]

free_value

(

va

)

free_value() [2/2]

free_value

(

vs

)

push_value()

push_value	(	vm	,
		make_int((int64_t)(uint64_t) r)	)

Variable Documentation

a

uint32_t a = (va.type == VAL_INT) ? (uint32_t)va.i : 0u

Definition at line 30 of file rol.c.

break

break

Definition at line 37 of file rol.c.

OP_ROTL

case OP_ROTL

Definition at line 27 of file rol.c.

r

s& uint32_t r = (s == 0u) ? a : ((a << s) | (a >> (32u - s)))

Definition at line 33 of file rol.c.

s

uint32_t s = (vs.type == VAL_INT) ? (uint32_t)vs.i : 0u

Definition at line 31 of file rol.c.

va

Value va = pop_value(vm)

Definition at line 29 of file rol.c.